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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>Document</title>
</head>
<body>
	<script type="text/javascript">
		/*	
		//正确变量名：
			var haha = 250;
			var xixi = 300;
			var a1 = 400;
			var a2 = 400;
			var abc_123 = 400;
			var $abc = 999;
			var $o0_0o$ = 888;
			var $ = 1000;
			var _ = 2000;
			var ________ = 3000;
		*/

		//var a-1 = 1000;           //不能有怪异符号
		//var a@ = 2000;		    //不能有怪异符号
		//var 2year = 3000;     	//不能以数字开头
		//var a￥ = 4000;       	//不能有怪异符号
		//var a*#$#$@ = 5000;   	//不能有怪异符号
		//var a b = 300;		    //不能有空格
		
		var A = 250;
		var a = 888;
		console.log(a + A);
	</script>
</body>
</html>